Module 3 - Benjamin-Mills

SS2.2
WHAT CHANGES OCCUR DURING STEELMAKING?
Changes in temperature
4 Using the information in Table 1, plot a graph to illustrate how the
temperature of the metal changes during the BOS process.
5 Draw a dotted line across your graph to show the target tapping
temperature. (This is the ideal temperature for steel leaving the converter at
the end of the oxygen blow.)
b The freezing point of pure iron is 1539°C yet the metal arriving from
the blast furnace is molten at a temperature of 1333°C. Why has it
not solidified?
c Write a short explanation of the changes in temperature shown by
your graph.
Part 2: Making a flow diagram
A flow diagram is one way of summarising the stages in a complex process such
as steelmaking. Flow diagrams can be helpful in picking out the main thread
from a complicated text and giving you a visual picture of the overall scheme.
Starting with blast furnace iron, as shown in the incomplete diagram in Figure
1, construct your own flow diagram to show the steps involved in steelmaking.
Make sure you show the steps in the right order and think about the substances
which leave the process as well as the ones that are added.
You can draw the flow diagram by hand or use a computer drawing program.
You may find it helpful to summarise other parts of your work in this way.
blast furnace iron
Figure 1 A flow diagram to show the production
of steel from iron
magnesium
steel
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„ Salters Advanced Chemistry 2000 – see Copyright restrictions